What materials do I need to fill this hole on my 2nd floor balcony? It's deeper than it looks. There's nothing for bondo or caulk to adhere to do not sure how to create a backing.


Photo of the hole

another angle

deck level top view

deck level bottom view

ground level view

ground level closeup

ground level zoom

  • That looks like a brick fell out or in, and critter(s) have been using it for access to the building. Can you get a picture from under the deck? Commented Sep 23, 2023 at 16:46
  • Thanks for fast response. Just uploaded new photos.
    – FalcoBalco
    Commented Sep 23, 2023 at 17:50

1 Answer 1


Looks like some bricks fell out (or in?). A mason or a DIY mason could put the bricks back in, perhaps.

A possibility: Try taking out the schmutz X'd out here:

bricks to remove

Then see about either adding bricks from below (can a mason do bricks upside down?) or fill the hole with some pressure-treated wood or plywood.

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